2020-Jan-20: For my more popular puzzles (including Sudoku, Kakuro, Inkies) I am now offering a "booklet" formatting option that produces two-puzzles per page, sideways. You can print these double-sided, fold & staple them to produce a booklet with the pages in the right order. You'll find this option on the final download screen for most one-per-page puzzles. Here's a sample. Answers are usually on a separate sheet so you can omit them, if you like.

Intermediate Killer Sudoku, Volume 6

Each booklet contains a collection of eight different puzzles, 1-per-page, with a page of answers in the back. The booklets are ordered by ascending difficulty -- the puzzles in book 100 are much harder than the puzzles in book 1. All these puzzles have a single unique solution.

These puzzles are in PDF format and need the Adobe Acrobat Reader to view or print.

You can also download all 800 of these puzzles, in the 4-per-page format ( with hints and answers, with answers but no hints, or with neither hints nor answers).

Want to save even more trees? Try the online version of these puzzles.

Here's a handy cheat-sheet of candidate cage sets that makes it easier to eliminate numbers.

Problems printing puzzles? Try these work-arounds.

Out of intermediate puzzles? Here's 800 more!.